tan choate



" (No Model.) v s. F. AN CHOATE.

ELECTRIC ARC LAMP.

No. 274,997. Patented A r; 3,1883.

I Mwewkm Wmmm I UNITED. STATES PATENT. price..

ELECTRlC-ARC-LAMP.

BRECIFIGATION forming part of Letterslatent No. 274,997, dated April 3,i883. e I Application filed June 12, 1582. (No model.)

To all whom it may concern;

uUs F. VAN

Be it known that I, SILVA CHOATE, a citizen oftheUnited States, and a yresidentofNew York, in the county otNew York and State of New York,'havein vented certain new and useful Improvements in Electric Inthe'accompanying drawings, Figure 1 is a vertical central section ontheline B B, Fig,

2, of one form of lamp constructedaccording to my invention. Fig.2 is ahorizontal sectionon the line A A ofjFig. 1.

l O is the globe or casing for the light-giving portion of the lamp, andD is an exterior translucent casing, the neck 'ot' which is tightlyfitted about the neckol the interior globe at E,-and may be hermeticallysealed at that point, if'l-desired. i

In order tomalic the description of my'invention more intelligible, andthat its nature may be more clearly undersiood, I' will first state thatF F represent-the division or sealing line between the bounds of thescaled case or globe and the other mechanisms, fixtures, and supports ofthe lamp and said case or globe. Whatever shapes or forms said case orglobe and the said mechanisms and supports may assume, there willnecessarily be a similar division-line between them. Everything on oneside of this line is to be considered as within said case or globe ander'er ','thi ng on the other" side of said line is to be consideredasou'tside of said case or globe.

G represents a cup or holder, oi brass or,

othersui'tablc material, supporting the lamp and inclosing the spool ofthe magnet.

' 11f represents th cmagnet, the pole of which extends beyond the line F17 into the interior of the casing 0, into proximity withanarmature',"K, which isfpivoted in a block or'stopper, L, secured tothe head of the magnetspool, and fillihgthe neck of theglobe 0, so as toclose it hermetically. The stopper L may be formed integral with thecore of the magnet or with the head of the spool.

Connected to or forming, a portion ofthe armature is a conductingrod orholder, M,for one of the electrodes X, while the metallic holder orsupport 0, carrying the other electrode, is mounted in aninsulating-plug seated in a hole bored in the block or stopper L. A

coiled spring, seated in a transvcrsergroovelin the block L, as shown,bears against the armature and tends to bring the electrodes intocontact. When the electric current passes, the armature is attracted'and separates the electrodes, thus forming the arc, which continues toburn so long as the current flows and the electrodes and u re.

The magnet His bored longitudinally at one side toreceivethe. insulatedcondnctin g-wire R,

which is connected to the end of thesupport O. The otherconducting-wire, S, is connected directly to the magnet H, from whichthe current passes to the support M through the plug L, which, in thearrangement of the connections here shown, is madeof a conductingmaterial, preferably brass, because its ratio of expansion andcontraction by heat is more nearly like that of glass than most otherconductors. The coils of the magnet are placed in circuit with the wiresR S and the electrodes N in a well-known manner.

, "Ihearma-ture and the other parts within the globe C may be mountedand supported in other ways without departing from the spirit of myinvention, and any suite}; means for sealing saidglobe may be en'gioyed.

I generally prefer to seal the exterior globe, D, air-tight, althoughthis is not absolutely necessary, and it..might evenbe made withopenings, and might simply. form a hood, the

idea -being to prevent free circulation oi the euvelc'peofair which isiii-contact with the interior globe, so that said globe shall not sud-'denly cool when the light isput out, and to also protect it' "from thedirect actionofi exterior currents of. cold air when the lamp isburning.

It is QTvious that the magnet might act upon the armature through thewall oriother portion of the casing,inste ad of extending into theinterior thereof; Such a'moditlcatijon is shown in Fig. 3, the variousparts being indicated by the same letters as in Figs. 1 and 2.

"a sealed casing, of a magnet the pole of which projects into thelemp'casing', said magnet being bored longitudinally to form it passageway for an insulated com] ucti n g'wire connect t ed with the interiorportions of the lamp.

2. The combination, with the lamp globe or casing, of the plug L, thearmature lever mouiited in said plug .and carr ing one of theelectrodes, and thelstendard O, also unpr nted in the plug; and carryingthe other electrode.

3. The eomhiuetioii with the pivoted electrodediolder M, mounted onarmature K, so as to be movable from the opposite electrode to i'ormtheatre, of a sealed casing s'urroundingseid holder and armature, and anexterior'magnetiz- 'iug-eoil for the electro-nmgnet which acts upon saidarmatiwe.

4. The combination of the sealed easing 0, the plugL, the fixedelectrode-holder Q, the

pivoted armature K, the holder; M mounted the alli S0, S1 to reek to andfrom the opposite holder, and the electromegnet H, arranged in themanner described, to act upon the armature in the sealed casing" andcause the separation of the electrodes. 5. The combination, with anelectric light, of a sealed casing, C, and an exterior casing, l);within whose neck the neek of easing U is fitted,- substantiallyasideeeribed.

The iee eien of the casing O, theplm L, fitting tilt-Q,- the inside ofthe neck of said me ee, d attaehed to themagnet H,the

armature K, pivoted in the plug, and the coiled spring let into the plugand acting to force the ermat-nve laterally away from the pole of themagnet.

Signed at New York, in the county of New Yorkand. State of New York,this 10th day of June, A. 1). 1882.

SILVANUS VAN OHOATE.

Witne H. QTQW'NSEM), THo-s. Tooivmv.

